That's slightly different: iHasApp is matching back against a list of URL schemes (check the repository, you'll find a big fat JSON file full of app identifiers

That's slightly different: iHasApp is matching back against a list of URL schemes (check the repository, you'll find a big fat JSON file full of app identifiers). This can tell you if an app is installed, but not if it's being actively run. See my answer above for how you can figure out whether an app is currently being used, rather than simply just installed.